Well my Tv remote is using the same batteries and is used a lot more and I haven't changed the batteries for 12 months

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How is the TV remote used a lot more?
I guess your TV remote is IR and lot less power hungry.

Personally my TV remote is used to switch the TV On & Off and increase/decrease volume!
I haven't changed the batteries in the TV remote for years. I just checked them and they were best before Mar 2014!

I have noticed the A3 is a little more power hungry than the A2 Lite but I honestly can't say how long the batteries are lasting. A couple of weeks, three, not sure? It does get a hammering daily, (typing this post now and most of my content on this Forum!), and all TV, YouTube and a lot of internet browsing.
I don't use voice search feature and I always deactivate the gyro/fly mouse myself as soon as I am done using it.

You shouldn't compare an airmouse to a TV remote!

I use rechargeable batteries and just pop in a charged set whenever the remote becomes unresponsive.

I've had to change the batteries twice in the two weeks since I got the U9, and I'm not even using it that much. Meanwhile, I can't even remember when was the last time I changed the batteries on my LG magic remote (which has an air mouse).

I've had to change the batteries twice in the two weeks since I got the U9, and I'm not even using it that much. Meanwhile, I can't even remember when was the last time I changed the batteries on my LG magic remote (which has an air mouse).

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@Villa post #5 pretty much sums it up ! I seem to get around a month or so but depending on usage and quality of batteries that can obviously vary.